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Accessories

This segment is made up of accessories, for example antennas, enclosures and M-Bus accessories, which are used to adapt or enhance our products.

CMa20 - Outdoor temperature/humidity sensor M-Bus

CMa20 is an outdoor temperature and humidity sensor which uses standard M-Bus communication. It has a high accuracy and provides information about momentaneous meter values as well as average meter values for the last hour and day.

Mechanics

Casing material:
Polystyrol
Protection class:
IP65
Dimensions (w x h x d):
110 x 100 x 52 mm
Mounting:
Wall-mount
Weight:
140 g

Electrical connections

Supply voltage:
From M-Bus
M-Bus slave port:
Screw terminal. Cable 0.25-1.5 mm², 0.5 Nm tightening torque

Electrical characteristics

Nominal voltage:
21-42 VDC

Environmental specifications

Operating temperature:
-40 °C to +55 °C
Operating humidity:
0 to 100 %
Operating altitude:
0-2000 m
Pollution degree:
Degree 2
Usage environment:
Outdoors
Storage temperature:
-40 °C to +85 °C
Measurement range, temperature sensor:
-40 °C to +55 °C
Measurement range, humidity sensor:
0 % RH to 100 % RH

Temperature sensor, margin of error

Temperature: 10 °C to 30 °C:
±0.2°C
Temperature: 0 °C to 10 °C:
±0.4°C
Temperature -10 °C to 0 °C:
±0.5°C
Temperature: below -10 °C or above 30 °C:
±1.5°C

Humidity sensor, margin of error

Humidity: 10 % RH to 90 % RH:
±2% RH
Humidity: below 10 % RH or above 90 % RH:
±4% RH

User interface

LCD diplay:
No
Momentary values:
Temperature, humidity, status
Historic values:
Average value over the last hour and last day

M-Bus

Interfaces:
M-Bus slave
M-Bus standard:
EN 13757

Wireless M-Bus

Integrated M-Bus Master

Wireless M-Bus Receiver

M-Bus slave interface

M-Bus baud rate, slave port:
300 and 2400 bit/s
Nominal voltage, slave port:
21-42 VDC
Addressing modes:
Primary, secondary
Power consumption:
1T/1.5 mA
Default address:
0

General

Data storage (examples)

Mobile Network

Fixed Network (Ethernet)

Integration

Compatibility:
Devices using the M-Bus protocol

Approvals

EMC:
EN 61000-6-2, EN 61000-6-3

Connections and Interfaces

Transmissions

For downloads, please visit our support site at: https://support.elvaco.com

Our website has gathered all resources you need to update, tune and troubleshoot your installations, such as:

  • Latest software versions
  • FAQs
  • Guides
  • In-depth technical information
  • Support forum

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